A level — a set — is 3 to 20 rounds. Each round is a pair: a blue reference object and a red one the player resizes. This page explains how to fill those slots and, if you bring your own picture, what to upload.
Only the silhouette is ever shown
Whatever you upload, the game throws the colours away. It keeps the transparent-background shape, fills it with one flat colour — blue for the reference, red for the object being resized — and draws that. Nobody ever sees your original picture, so detail, style and palette do not matter. The outline does.
This is why a transparent background is not optional: the transparency is the shape. A photo on a white background has no shape to cut out and will be rejected.
Pictures we actually used
Three of the game's own files, shown as they sit on disk and as the game draws them. All of them are 256×256 PNGs with a transparent background and a single subject filling the frame.
The fileWhat players see
Adult human · 68×252 px
The fileWhat players see
African bush elephant · 256×222 px
The fileWhat players see
Tyrannosaurus rex · 223×255 px
What to upload
A PNG or WebP with a genuinely transparent background, up to 250 KB.
One subject, seen from the side or straight on, filling most of the frame.
A clean, closed outline — the shape is the whole puzzle.
The whole subject in view: nothing cropped off at the edges.
A square 256×256 file is ideal, or 512×512 if the outline really needs the detail. The game measures the drawing, not the empty space around it.
What to avoid
Photos on a white or checkered background — there is no transparency to cut out.
Several objects, a logo, or text in the same picture.
Thin outlines or line art with a hollow inside; it will read as a cage, not a shape.
Drop shadows, glows and soft edges baked into the file: they become part of the silhouette.
Anything you do not have the right to publish.
Building a set, step by step
Open the Workshop and add rounds
Go to the Workshop tab and press Create a set. Start from a themed pack to get three ready-made rounds, then change whatever you like. A set needs at least 3 rounds and takes up to 20.
Fill the blue slot
The blue object is the reference; its size stays fixed, but players can drag it alongside the red object. A familiar object works best — a person, a car, the Moon. Search the catalog, or switch the slot to Custom object.
Give your own object a real size
For a custom object, enter a name and its real height, with a unit. Width is optional: leave it empty and the picture keeps its own proportions; fill it in and the shape is stretched to match both numbers.
Choose its silhouette
Pick a simple shape, borrow the silhouette of any catalog object, or choose Upload my own PNG and pick your file. The preview beside the button shows exactly the silhouette players will see.
Check the preview and publish
Each round draws both objects at true relative scale, so you can see straight away whether the pair makes an interesting puzzle. Name the set and publish it for 50 coins, then share the link.
Ready to build one?
The Workshop keeps a draft of whatever you are working on in this browser, so you can stop and come back to it.
Either it is over 250 KB, it is not a PNG or WebP, or it has no transparent background. The game cuts the silhouette out of the transparency, so a picture whose background is solid white has nothing to cut.
How big is the uploaded file in the end?
Small. The upload is trimmed to the drawing, scaled down and re-encoded as a plain white-on-transparent shape, which usually lands at a few kilobytes. Your original file never leaves your browser.
What size should I enter?
The real-world size of the thing you drew, matching the drawing's height. If the artwork shows a whale from the side, the height you type is the height of the drawn whale, not its length — the game then works the length out from the picture's own proportions.
What do I earn from a set?
Publishing costs 50 coins. After that, you earn 1 coin each time a different signed-in player finishes your set and likes it. Plays on their own do not earn coins.
Fictional characters, ships and heroes are shown only as one-colour silhouettes for size comparison. All trademarks belong to their respective owners.
The file
The file
The file